Hot-air furnace



3 Sheets-Sheet 1.

(No Model.)

H. N. HEMINGWAY.

HOT AIR FURNACE.

No. 443,849. Patented Dec. 30,1890.

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3 Sheets-Sheet 2.

(No Model.)

H. N. HEMINGWAY.

HOT AIR FURNACE.

' Patented Dec. 30, 1890.

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UNITED STATES PATENT OFFICE.

nanny N. lIEMINGWAY, or AUBURN, NEW YORK.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 443,8d9, dated.December 30, 1890.

Application filed August f1, 1890.

To all whom it may concern.-

Be it known that I, HENRY N. HEMING-WAY, of Auburn, in the county ofCayuga and State of New York, have invented certain new and usefulImprovements in Hot-Air Furnaces; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it pertains to make anduse it, reference being had to the accompanying drawings, which form apart of this specification. I

My invention relates to an improvement in hot-air furnaces; and itconsists in the construction and arrangement of parts, which will bemore fully described hereinafter.

The objectof my invention is to produce a hot-air furnace which. issimple and effective, and in which the construction is such that theadvantages, conveniences, and results hereinafter described areaccomplished.

Figure 1 is a vertical section of a furnace which embodies myinvention.Fig. 2 is a vertical section taken at right angles to Fig. 1. Fig. 3 isa top plan view. Fig. 4 is a side view.

A represents the base, which has its upper end curved outward andupward, as at B, and to the upper edge of this curved portion is securedthe lower end of the outer inclosing case or shell 0. Placed within theouter casing, and having its lower end supported upon the base A at thejunction of the curved and vertical portions of the base A, is thefire-pot D, in the lower end of which a grate of any desiredconstruction is placed. Supported upon the upper end of this fire-potare the flue-heads E, which are provided with suitable fianges, in whichthe ends of the'flues catch, as shown in Fig. 2. These fines are placed,as shown, directly over the fire-pot, and, together with the heads E,form what may be termed the firebox, as the smoke and products ofcombustion pass between them to the smoke-stack F, which has its lowerend fastened to the horizontal plate or head G, which is secured to theupper ends of the heads E and forms the top of the fire-box. Theinclosing case 0 extends above the upper end of the tire-box, as shown,and formsa hotair dome H, which is in communication with the hot-airchambers or spaces I, as shown. This casin g, however, is cut away atits rear Serial No. 360,976. (No model.)

top side, as shown at J, Fig. 2, and which cutaway portion extends inbeyond the rear ends of the fiues a suitable distance, as shown,and thefire-box head G is provided with a series of openings K, through whichaccess is had for the purpose of cleaning out soot from between thefines. Each opening is provided with a separate cover, so that but oneneed be opened at a time, and thus avoid the great amount of escape ofgas that would occur if a single cover was provided for all of theopenings. 1 preferably place each of these openings at a pointwhich willallow access to two of the spaces between the fines, and by means of abrush having a suitably-shaped handle the spaces can be cleanedthroughout their entire length.

The firebox, as shown by dotted lines in Fig. 3, is square, and theinclosing case 0 is cut away at its corners, as shown, so that thecorners of the fire-box are in contact therewith, which makes the hotairspaces separate from each other, except at their upper and lower ends,which construction causes the air to circulate through the tines. Ifdesired, however, the inclosing case may be made circular in form, inwhich event the corners of the firebox will be in contact with thecasing and the hot-air chambers separate and distinct in the samemanner, as here shown, by cutting the corners of the casing away.

For the purpose of causing the air to pass back and forth through thetines as it passes to the dome, a division-plate L is placed above thecold-air'inlet M, which directs the incoming air around the fire-pot. tothe front hot air chamber. There are also division or partition plates Nplaced in the centers of the flues, as shown in Fig. 1, which extendentirely through the fines and have their front ends extending throughand closing the front airspace at this point, as shown in Fig. 2. Theseplates direct the air through the flues to the rear air-chamber, whichhas no connection at its upper end with the dome by reason of thecut-away portion thereof at J, and the air then passes through the upperfines to the front air-chamber, and from thence to the dome. contractedat their upper-ends, where they connect with the dome. By means of thisconstruction it will be seen that the incoming The side air-chambers arepreferably IOC air is first caused to circulate around the firepotand topass back and forth through the fines before it reaches the dome, whichheats the air to a high degree with comparatively little fuel.

Secured to the rear or to one or both sides of the inclosiug case is acoal-magazine I, which has a doorin its upper end and a door Q at itslower end. The lower end of this magazine is inclined, as shown, andcommunicating therewith is an inclined chute R, which extends across theair-space to thefirepot. Placed in the magazine above the door Q isaslide S, which is inserted in place when it is desired to-open the doorQ for any'purpose, and this slide prevents the coal from falling downwhile the door is open.

Having thus described my invention, I claim- 1. In a hot-air furnace, abase having a central opening and an annular flange extending around theopening, a fire-pot having its lower end close the said central opening,a set of flues above and supported by the upper end of the fire-pot, aninelosing case having its lower end supported upon the outer edge of theannular flange, and an air-inletopening opposite the fire-pot,substantially as shown. 2. In a hot-air furnace, a base, a fire-potsupported thereon, a series of flues above the fire-pot, aninclosingease separated from the flues to form an air-space at each end of thefines and extending above the fines so as to form a dome, the said domecut away at one end for the purpose described, the plate L, anair-opening below the plate, and the divisionplates N, whereby the aircirculates around the firepot back and forth through the flues and tothe dome, combined substantially as shown.

Ina hot-air furnace, a base having an upwardly and outwardly curvedupper portion, a fire-pot of smaller diameter supported by the basewithin the curved portion, a set of fluesabove the fire-pot andsupported thereby, heads at each end of the fines for closing the spacesbetween them, the inelosing case having its lower edge secured to thecurved portion, the division-plates L N, and an airiulet opening belowthe plate L, combined substantially as set forth.

4:. In a hot-air furnace, a base, a fire-pot, an angular fire-box abovethe firepot, consistin g of fines, and an outer casing which engagesonly the corners of the fire-box, whereby the space between the casingand the fire-box is divided into separate chambers, combinedsubstantially as specified.

5. In a hot-air furnace, a base, a fire-pot, an angular fire-box abovethe fire-pot, consistin g of lines having spaces between them, headstherefor which close the spaces, and the division-plates L N, combinedsubstantially as shown.

6. The combination, with a hot-air furnace having an outer casing and atire-pot therein, of a coal-magazine secured to the outer side thereof,having a door in its lower end, and a transverse slide which extendsacross the magazine above the door, and a chute which connects with themagazine at one end below the said slide and at the opposite end withthe fire-pot, substantially as described.

7. The combination, with a hotair furnace having an outer casing and afire-pot therein, of a coal-magazine secured to the outer side thereof,having a door in its lower end, a transverse slide which extends acrossthe magazine above the door. a chute which connects at one end with thefire-pot and at its opposite end with the magazine below the said slide,and a second vertical slide which extends across the outer end of thechute, substantially as specified.

In testimony whereof I afiix my signature in presence of two witnesses.

HENRY N. lIEMING\VAY.

\Vitnesses:

A. G. TREAT, GEO. II. MAcoMBER.

